Most water plants spread very quickly, so you may only need to buy one of each for your small garden. If you need to thin fast-growing plants from your container, be sure not to put them in natural waterways, where they can become invasive.

Set a trio of small floating plants--water lettuce (Pistia stratiotes), water poppy (Hydrocleys nymphoides) and oval-shape Salvinia--in a square pot. Even without the occasional yellow poppy blossoms, the composition boasts an interesting mix of pleated, shiny rounded, and tiny oval leaves.

Add color to enamelware with floating fern (Salvinia minima) and water hyacinth (Eichhornia crassipes), an easy-to-grow water plant.

What happens to your tabletop garden in winter? In the Midwest, most water plants are grown as annuals. Some water plants can be overwintered indoors in an aquarium or in containers of wet, sandy loam; check with your local garden center for information specific to your area and the plants you have.